2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/189848A K-matrix formalism is used to relate single-channel and multi-channel fits. We show how the single-channel formalism changes as new hadronic channels become accessible. These relations are compared to those commonly used to fit pseudoscalar meson photoproduction data.9 pages, 2 figures. A numerical example has been addedNuclear Theorytext